【单选题】
<img title=无标题419.jpg alt=无标题419.jpg src=https://huaweicloudobs.ahjxjy.cn/2788D69147DD77434BC758F4CC3D0CAA.jpg/>
①
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/AD1D7CB5C66800E5E9D703E9B97CDCBD.png data-tex={ Z }_{ 1 }=(15.9-j4.78)\Omega />
②
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/0CDBED7DAB1C6DAB7B52DF2E599B2758.png data-tex={ Z }_{ 1 }=(15.9+j4.78)\Omega />
③
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/467FC96416EC7DCB42A759F57175383F.png data-tex={ Z }_{ 1 }=(4.78+j15.9)\Omega />
④
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/CF99EF8F42F56B72F07A7CB3EA3BAC89.png data-tex={ Z }_{ 1 }=(4.78-j15.9)\Omega />
【单选题】
<img title=无标题111.jpg alt=无标题111.jpg src=https://huaweicloudobs.ahjxjy.cn/FFCD140DADA89A325E403473DAA48141.jpg/>
①
U=<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/6A43875296E96D82DD9C7F8B49F073F6.png data-tex=U=311V\quad ,\quad \varphi ={ 30 }^{ 0 }\quad ,\quad f=50Hz\quad ,\quad T=0.02s/>
②
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/663CC69DAF02F253B0F28D246F4B581A.png data-tex=U=220V\quad ,\quad \varphi ={ 30 }^{ 0 }\quad ,\quad f=50Hz\quad ,\quad T=0.02s/>
③
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/DE2EF4673D0C1D771A6D98DB66C48AE1.png data-tex=U=220V\quad ,\quad \varphi ={ 30 }^{ 0 }\quad ,\quad f=314Hz\quad ,\quad T=0.02s/>
④
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/5682E00D63ADB8357EC4F633D27AEE8C.png data-tex=U=220V\quad ,\quad \varphi ={ 30 }^{ 0 }\quad ,\quad f=50Hz\quad ,\quad T=314s/>